Chaperonins are a type of protein that assist in the proper folding of other proteins within cells. They provide a protective environment, allowing newly synthesized proteins to fold correctly without the risk of aggregation or misfolding, which can lead to cellular dysfunction. These molecular machines typically consist of two stacked rings, forming a chamber where the target protein can fold. Chaperonins are essential for maintaining cellular health and are found in various organisms, from bacteria to humans, highlighting their fundamental role in biology.